Improved Layout of welcome page

* iconbars are now larger
* added tooltips to icons
* changed eventlist layout
Merge branch 'master' of github.com:itedd/itedd

Conflicts:
	app/assets/stylesheets/application.css.scss
changed layout

* changed icon for hiding events
changed color of text in faq and removed headline
readded menu entry for overview page
cleaned up the application.css file
Unsinnige Überschriften entfernt, Aktueller Menupunkt ist markiert, events.ics reaktiviert